Hi @Lee Baldock
When you purchase Microsoft 365 Business Standard, you have the option of adding a domain you own, or buying one. Check out Sign up for a Microsoft 365 Business Standard subscription.
Please check this document that we'll walk you through the steps of adding an existing domain you already own or buying a new one. If you purchased a new domain when you signed up, your domain is all set up and you can move to Add users and assign licenses.
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